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Chattel Paper Agreements (Details-1) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Cumulative effect of new accounting guidance, retained earnings   $ (142)
Chattel Paper Agreements [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreement, maximum exposure $ 10,000  
Repurchase-to-Maturity Transactions, loans due 3,806  
Cumulative effect of new accounting guidance, retained earnings   $ (100)
2015 [Member] | Chattel Paper Agreements [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase-to-Maturity Transactions, loans due 132  
2016 [Member] | Chattel Paper Agreements [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase-to-Maturity Transactions, loans due 735  
2017 [Member] | Chattel Paper Agreements [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase-to-Maturity Transactions, loans due 472  
2018 [Member] | Chattel Paper Agreements [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase-to-Maturity Transactions, loans due 504  
Thereafter [Member] | Chattel Paper Agreements [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase-to-Maturity Transactions, loans due $ 1,963  
Minimum [Member] | Chattel Paper Agreements [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
MGE guarantee to the financial institution, term 1 year  
Maximum [Member] | Chattel Paper Agreements [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
MGE guarantee to the financial institution, term 10 years